Tab inline completion (#6802)

* Make Tab insert (partial) completion instead of select next menu item

* Use reedline feature branch

Co-authored-by: JT <547158+jntrnr@users.noreply.github.com>

crates/nu-cli/src/reedline_config.rs

@@ -491,7 +491,7 @@ fn add_menu_keybindings(keybindings: &mut Keybindings) {
         KeyCode::Tab,
         ReedlineEvent::UntilFound(vec![
             ReedlineEvent::Menu("completion_menu".to_string()),
-            ReedlineEvent::MenuNext,
+            ReedlineEvent::Edit(vec![EditCommand::Complete]),
         ]),
     );